Mounts to Kaiser lighting units with (205582 / 205592) Filter Holders. 2 pieces. Dimensions: 25.2x8.3 in./64x21 cm for use with Lighting Units (205589, 205590, 205591, 205595, 205656, 205657). Can be trimmed to 19.7x8.3 in/50x21 cm for use with Lighting Units (205556, 205557, 205558, 205588, 205867 and 205868)